src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java

   1 /*
   2  * DemosceneMusic - DataManager.java - Copyright © 2012 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.demoscenemusic.data;
  19
  20 import java.sql.ResultSet;
  21 import java.sql.SQLException;
  22 import java.util.ArrayList;
  23 import java.util.Collection;
  24 import java.util.HashSet;
  25 import java.util.List;
  26 import java.util.concurrent.Callable;
  27
  28 import net.pterodactylus.util.collection.Memoizer;
  29 import net.pterodactylus.util.database.Database;
  30 import net.pterodactylus.util.database.DatabaseException;
  31 import net.pterodactylus.util.database.Field;
  32 import net.pterodactylus.util.database.Join;
  33 import net.pterodactylus.util.database.Join.JoinType;
  34 import net.pterodactylus.util.database.ObjectCreator;
  35 import net.pterodactylus.util.database.OrderField;
  36 import net.pterodactylus.util.database.OrderField.Order;
  37 import net.pterodactylus.util.database.Parameter.StringParameter;
  38 import net.pterodactylus.util.database.Query;
  39 import net.pterodactylus.util.database.Query.Type;
  40 import net.pterodactylus.util.database.ResultProcessor;
  41 import net.pterodactylus.util.database.ValueField;
  42 import net.pterodactylus.util.database.ValueFieldWhereClause;
  43
  44 /**
  45  * TODO
  46  *
  47  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  48  */
  49 public class DataManager {
  50
  51         private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
  52
  53         private final Database database;
  54
  55         public DataManager(Database database) {
  56                 this.database = database;
  57         }
  58
  59         public Collection<Artist> getAllArtists() throws DatabaseException {
  60                 Query query = new Query(Type.SELECT, "ARTISTS");
  61                 query.addField(new Field("ARTISTS.*"));
  62                 return database.getMultiple(query, artistCreator);
  63         }
  64
  65         public Artist getArtistById(String id) throws DatabaseException {
  66                 Query query = new Query(Type.SELECT, "ARTISTS");
  67                 query.addField(new Field("ARTISTS.*"));
  68                 query.addField(new Field("GROUP_ARTISTS.*"));
  69                 query.addField(new Field("GROUPS.*"));
  70                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  71                 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
  72                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  73                 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
  74                 ArtistLoader artistLoader = new ArtistLoader();
  75                 database.process(query, artistLoader);
  76                 return artistLoader.get();
  77         }
  78
  79         public Track trackById(String id) throws DatabaseException {
  80                 Query query = new Query(Type.SELECT, "TRACKS");
  81                 query.addField(new Field("TRACKS.*"));
  82                 query.addField(new Field("TRACK_ARTISTS.*"));
  83                 query.addField(new Field("ARTISTS.*"));
  84                 query.addField(new Field("TRACK_STYLES.*"));
  85                 query.addField(new Field("STYLES.*"));
  86                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  87                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  88                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  89                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  90                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  91                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  92                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  93                 TrackLoader trackLoader = new TrackLoader();
  94                 database.process(query, trackLoader);
  95                 return trackLoader.get();
  96         }
  97
  98         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
  99                 Query query = new Query(Type.SELECT, "TRACKS");
 100                 query.addField(new Field("TRACKS.*"));
 101                 query.addField(new Field("TRACK_ARTISTS.*"));
 102                 query.addField(new Field("ARTISTS.*"));
 103                 query.addField(new Field("TRACK_STYLES.*"));
 104                 query.addField(new Field("STYLES.*"));
 105                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 106                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
 107                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
 108                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
 109                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
 110                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
 111                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
 112                 TrackLoader trackLoader = new TrackLoader();
 113                 database.process(query, trackLoader);
 114                 return trackLoader.all();
 115         }
 116
 117         public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
 118                 Query query = new Query(Type.SELECT, "GROUPS");
 119                 query.addField(new Field("GROUPS.*"));
 120                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
 121                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
 122                 return database.getMultiple(query, DefaultGroup.CREATOR);
 123         }
 124
 125         private class TrackLoader implements ResultProcessor {
 126
 127                 private final List<Track> loadedTracks = new ArrayList<Track>();
 128                 private Track track;
 129
 130                 public Track get() {
 131                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 132                 }
 133
 134                 public List<Track> all() {
 135                         return loadedTracks;
 136                 }
 137
 138                 /**
 139                  * {@inheritDoc}
 140                  */
 141                 public void processResult(ResultSet resultSet) throws SQLException {
 142                         String trackId = resultSet.getString("TRACKS.ID");
 143                         if ((track == null) || (!track.id().equals(trackId))) {
 144                                 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 145                                 loadedTracks.add(track);
 146                         }
 147                         Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 148                         if (!track.artists().contains(artist)) {
 149                                 track.artists().add(artist);
 150                         }
 151                         Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
 152                         track.styles().add(style);
 153                 }
 154
 155         }
 156
 157         private class ArtistLoader implements ResultProcessor {
 158
 159                 private final List<Artist> artists = new ArrayList<Artist>();
 160                 private Artist artist;
 161
 162                 public Artist get() {
 163                         return artists.isEmpty() ? null : artists.get(0);
 164                 }
 165
 166                 public List<Artist> all() {
 167                         return artists;
 168                 }
 169
 170                 //
 171                 // RESULTPROCESSOR METHODS
 172                 //
 173
 174                 /**
 175                  * {@inheritDoc}
 176                  */
 177                 public void processResult(ResultSet resultSet) throws SQLException {
 178                         String artistId = resultSet.getString("ARTISTS.ID");
 179                         if ((artist == null) || (!artist.id().equals(artistId))) {
 180                                 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 181                                 artists.add(artist);
 182                         }
 183
 184                         Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 185                         artist.groups().add(group);
 186                 }
 187
 188         }
 189
 190         private class LazyArtist extends DefaultArtist {
 191
 192                 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
 193                         public Void call() throws DatabaseException {
 194                                 if (!hasValue("tracks")) {
 195                                         value("tracks", Collection.class).set(getTracksByArtist(id()));
 196                                 }
 197                                 return null;
 198                         }
 199                 });
 200
 201                 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 202
 203                         @Override
 204                         public Void call() throws Exception {
 205                                 if (!hasValue("groups")) {
 206                                         value("groups", Collection.class).set(getGroupsByArtist(id()));
 207                                 }
 208                                 return null;
 209                         }
 210
 211                 });
 212
 213                 public LazyArtist(String id) {
 214                         super(id);
 215                 }
 216
 217                 /**
 218                  * {@inheritDoc}
 219                  */
 220                 @Override
 221                 public Collection<Group> groups() {
 222                         groupsMemoizer.get();
 223                         return super.groups();
 224                 }
 225
 226                 public Collection<Track> tracks() {
 227                         tracksMemoizer.get();
 228                         return super.tracks();
 229                 }
 230
 231         }
 232
 233         private class ArtistCreator implements ObjectCreator<Artist> {
 234
 235                 /**
 236                  * {@inheritDoc}
 237                  */
 238                 @Override
 239                 public Artist createObject(ResultSet resultSet) throws SQLException {
 240                         return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 241                 }
 242
 243         }
 244
 245 }